Control method for four-way valve

Abstract

The invention discloses low-reversing reliability and frequency method for controlling a four-way valve, which comprises control processes under the following use conditions: during heat generation, time A is determined according to an ambient temperature and an unloading electromagnetic valve is turned off at the same time, then the cold air-resistance operation of an indoor fan and an inverter compressor are started, a pilot valve of a four-way wave is turned on to act when the inverter compressor operates for 180+A seconds, and the four-way valve realizes inversion and an outdoor fan operates at the same time; for machine stop during heat generation, the inverter compressor and the outdoor fan are turned off first, then the unloading electromagnetic valve is turned on to allow an exhaust pipe and an intake pipe to be communicated continuously for time B, and finally the pilot valve of the four-way valve is controlled to be turned off to reset and the indoor fan is turned off at the same time, wherein the time B is between 5 and 15 seconds; and during heat regeneration, the unloading electromagnetic valve is turned off first and the pilot valve of the four-way valve is controlled to be turned on to act at the same time, then the inverter compressor is started, and the indoor fan starts cold air-resistance operation and the outdoor fan starts operation when the inverter compressor operates for 180 seconds.

Description

technical field [0001] The invention relates to the technical field of an air source heat pump frequency conversion air conditioner, in particular to a control method of a four-way valve. Background technique [0002] At present, the four-way valve is one of the key components of the air source heat pump inverter air conditioner. The four-way valve is generally composed of a valve body, a main slide valve, a pilot valve and other related accessories. The specific structure is as follows: figure 1 As shown, the air source heat pump inverter air conditioner relies on the reversing of the main slide valve of the four-way valve to switch between the cooling mode and the heating mode, while the reversing of the main slide valve of the four-way valve in the prior art must meet the following basic requirements: condition, the pilot valve moves after being powered, and the piston chambers at both ends of the main spool valve are respectively connected with the exhaust pipe and sucti...

AI Technical Summary

Problems solved by technology

[0004] From the above analysis, it can be seen that in a low temperature environment, when the air source heat pump inverter air conditioner is set to the heating mode, the main valve of the four-way valve cannot be switched due to the insufficient pressure difference between the exhaust pipe and the suction pipe, which is easy Fault, and every time the air source heat pump inverter air conditioner uses the heating mode, the main valve of the four-way valve will change direction twice. Then, in the whole cold season, the user uses the heating mode, and the main valve of the four-way valve The number of valve reversing will be very large, which greatly increases the probability of reversing failure of the four-way valve. Therefore, the reversing reliability of the existing four-way valve is low and the number of reversing times is high.

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